Measurement of the asymmetry parameter in the {beta}-decay of {sup 35}Ar

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Bulletin of the American Physical Society

OSTI ID:127820

Converse, A; Haeberli, W; Miller, M ^[1]

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1. Univ. of Wisconsin, Madison, WI (United States); and others

The authors measured the asymmetry parameter, A{sub o}, for the beta decay of {sup 35}Ar to test the CVC hypothesis. Theory predicts A{sub o} =0.420{plus_minus}0.007 for the ground state decay of {sup 35}Ar. While early measurements disagree with this prediction (A{sub o}=0.22{plus_minus}0.03), a recent experiment gave A{sub o}= 0.49{plus_minus}0.10. The polarized sample was produced by {sup 35}Cl(p,n){sup 35}Ar, with the polarization deduced from the asymmetry in the decay to the first excited state of {sup 35}Cl. Excited state decays were identified by coincidences between {beta}`s and {gamma}`s observed in Ge detectors. The present experiment used a pure Cl{sub 2} target, higher beam current (80 nA vs. 5nA), and higher beam polarization (70% vs. 50%). Preliminary analysis of the data yields the value A{sub o} = 0.42{plus_minus}0.03. The error is dominated by the statistical uncertainty.

• OSTI ID: 127820
• Report Number(s): CONF-920376--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 37; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ARGON 35
ASYMMETRY COEFFICIENTS
BETA DECAY